Is there a way to estimate 2021 taxes now and do "what if" scenarios?

[jwhoover]

I will have large depreciation recapture taxes this year and want to see the effect of charitable
donations.

[DoninGA]

You can try using the TurboTax calculator TaxCaster for estimating tax liabilities or tax refunds - https://turbotax.intuit.com/tax-tools/calculators/taxcaster/

[xmasbaby0]

Whatever you do---do NOT mess with your 2020 return if you used online TT.   Online TurboTax does not include the "what if" feature that is a feature of only the CD/download software.   If you used the CD/download for 2020 you can use the what if feature in that program.

[Hal_Al]

This tool is not the same as an actual return, but can be useful for estimates.  It's still set up for 2020, but that will only make a few dollars difference:

https://turbotax.intuit.com/tax-tools/calculators/taxcaster/